$\frac{x+1}{x-1}+2>\:0$
$\int x^3\cdot c^{3x}dx$
$x^2-4x+4=3\cdot e^{-t}$
$-2y+5y$
$x^2+8x-2$
$\int\left(\frac{x^3-x^2+x-1}{3x}\right)dx$
$\left(x+2\right)\left(4\right)$
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